John murray mitchell



(No' Model.)' 2 ShetsSheet 1.

J. M.-MITOHELL.

MACHINE FOR MIXING GOMBUSTIBLB GAS AND AIR.

No. 558,408 Patented Apr. 14, 1896. I

WITNESSES: Q/AM l/VVE/VTOI? ANDREW B GRAHAM. PHGTO-UTNQ WASHINGTON. D12

(No Model.) 2 Sheets--Sheet 2.

J. M. MITCHELL. I MACHINE FOB MIXING OOMBUSTIBLE GAS AND AIR.

No. 558,40'8. PatentedApn' 14, 1 896.

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AMIREW llGflAllAM, PHOT0-UTHO.WASH INGTOIL u c UNITED STATES PATENTOFFICE.

JOHN MURRAY MITCHELL, OF NEW YORK, N. Y.

MACHINE FOR MIXING COMBUSTIBLE GAS AND AIR.

SPECIFICATION forming part of Letters Patent No. 558,408, dated April14, 1896. Application filed December 23,1889. SerlalNo. 334,781. (romanTo all whom it may concern.-

Be it known that I, JOHN MURRAY MITCH- ELL, a citizen of the UnitedStates, and a resident of New York, in the county of New York and Stateof New York, have invented certain new and useful Improvements inMachines for Mixing Combustible Gas and Air, of which the following is aspecification.

This invention relates to improvements in air and gas mixers.

It has for its object the provision of such a device whereby air and gascan be mixed in any desired proportions.

The invention consists primarily of two compressors adapted torespectively force air and gas into a common receptacle in such a manneras to be thoroughly mixed. These compressors are operated at the samerate of speed, relatively, and the quantities of air and gas forced intothe mixture are regulated without changing the speed of the compressors,by moving certain valves or gates which control certain ports in eachcompressor.

The invention also consists in the novel construction, combination, andarrangement of parts, such as will be hereinafter more fully described,pointed out in the appended claims, and illustrated in the accompanyingdrawings.

In the accompanying drawings, in which similar letters and numerals ofreference designate corresponding parts, Figure 1 is a verticaltransverse section of a machine embodying the invention, parts being inelevation; and Fig. 2 is a longitudinal vertical section of the same,parts also being in elevation.

Referring to the drawings by letters and numerals, A and B respectivelydesignate the chambers in which the air and gas compressor pistons arelocated.' In the present instance the chambers are represented as beingcylinders, which with the compressor-pistons respectively located in thesame are of exactly the same construction, only varying in size. As thedescription of one can be applied equally as well to the other, thechamber A and the compressor-piston located therein, being the larger,will be described.

The chamber A has an inlet-port 1 and an outlet-port 2, each enlarged atthe inner end by a recess 3, which recesses extend in oppositedirections. Within the chamber A is located a compressor-piston wherebyair can be drawn into the chamber through the port 1 and expelledthrough the port 2, mechanism being provided whereby the amount of aircompressed and forced through the eductionport can be regulated asdesired. In the present instance the compressor-piston consists of thecylindrical piston-body 4, eccentrically mounted within the cylindricalchamber A, being mounted 011 the shaft 5, suitably journaled in thesides of the casing, and the sliding wings 13. The relative arrangementsand dimensions of the compression-piston and the cylindrical chamber aresuch that a part of the former will contact with the inner face of thelatter through its entire length.

'WVithin the cylindrical piston-body 4 the chamber 15 is formed andprovided at opposite ends with a slot 12. On each side of the saidchamber 15 a sliding blade or paddle 13 is mounted, which is providedwith an arm 14, passing through a slot 16 in the side wall of thechamber. A spring 45, suitably connected with the piston-body and thearm 14 of the sliding blade or paddle, serves to draw or pull the latterout of the piston-body and press its outer edge against the innersurface of the cylindrical chamber A. By the rotation in the properdirection of the piston air is drawn into the cylindrical chamberthrough the port 1 and is forced out through the port 2.

The compressor-piston is provided with a mechanism whereby the amount ofair forced out of the chamber can be regulated. This mechanism will nowbe described.

The sliding blade 13 is provided with a port or opening 17, which can beclosed more or less or entirely by a sliding gate or valve 18 restingagainst the blade and projecting with the latter through the slot 12 ofthe cylindrical piston-body. Said gate or valve 18 is provided with anarm 19, with which is connected a spring 20, fastened to: the end wallof the chamber 15. This spring serves to draw or pull the gate outwardso as to close the port 1'7.

A mechanism for adjusting or regulating the movement of the gate orvalve 18 is provided. The shaft 5, journaled in opposite sides of thecasing 7 and on which the piston-body 1 is mounted, is hollow ortubular.

arm 12 projects laterally from the inner end of the sliding gate 18'andby the spring 20 is pressed against the conical piece 8. By movin g theconical piece the sliding gate can be moved to cover the port 17 of theblade 13 more or less, as it may be desired. The blade 13v is providedat its outer end with a projection 46, which serves to engage with thesliding gate 18 to withdraw the latter at the same time the blade isforced into the recess 15 by the curved face of the cylindrical chamber.In the opposite side of the recess a sliding paddle or blade and gateprecisely like those first described are arranged.

The inlet-port 1 of the cylindrical chamber A is connected with a pipe25 for conducting air to the said chamber, and the inlet-port 1 of thecylindrical chamber B is connected with a suitable pipe 26 for takinggas to the said chamber 13. The outlet-port 2 of the cylindrical chamberA is connected with a suitable pipe 27 for carrying 01f the compressed.air, and the outlet-port 2 of the cylindrical chamber 13 is connectedwith a pipe 28, terminating in a nozzle 29 within the pipe 27, therebyforming an injector by means of which a current of compressed gas isinjected into the current of compressed air generated in the cylinder A.

Means suitable in the premises are provided for rotating thecompressorpistons within their respective chambers at the same rate ofspeed.

The operation of the device is as followsz As the compressor-pistons arerotated the paddles 13 13 are alternately pressed into the piston-bodyand forced out of the same, the outer ends of the said paddles at alltimes remaining in contact with the inner surfaces of the cylindricalchambers A and B. These rotating paddles draw in and compress the gasand air. According to the quality or richness of gas-that is, accordingto the amount of hydrocarbon contained in the same-tl1e quantities ofgas and air mixed must be re ulated. This is accomplished by turning thespindle 10 to move the conical piece 8 to separate more or less the arms12 12, and conse-. quently the sliding gates 1818, to which they areattached. By moving the gates outwardly as far as possible it will causethe compressor to operate to its fullest capacity. By withdrawing thegates, so as to open the ports 17 17, the capacity of the compressorswill be diminished, inasmuch as a certain amount of air, which wouldotherwise be forced in front of the paddles, would escape through theopenings.

It is obvious that by moving the gates controlling the ports of eitherthe gas or the air compressor, the proportions of air and gas formingthe mixture can be varied.

Having thus described my invention and set forth its merits, What Iclaim, and desire to secure by Letters Patent, is

1. In an air and gas mixer, the combination of a chamber provided withinduction and eduetion ports, a compressor-piston within said chamberand having a port formed in a part thereof, an adjustable gate to saidport for partially or entirely closing the same, to regulate thequantity of air or gas to be compressed and pumped, and means forpositively adjusting said gate, substantially as and for the purposesdescribed.

2. In an air and gas mixer, the combination of a chamber provided withinduction and eduetion ports, a compressor-piston mounted within thesaid chamber and having a part thereof provided with a port or ports,and means for varying the area of said port or ports to regulate thequantity of air or gas to be compressed and pumped, substantially asdescribed.

3. In an air and gas mixer, the combination of the chamber, thecompressor-piston mounted therein consisting of the piston-body, and theblades carried by the said piston-body, the said blades havingvalve-controlled ports, substantially as described.

4:. In an air and gas mixer, the combination of the cylindrical chamber,having induction and eduetion ports, the compressor-piston mountedtherein consisting of the piston-body eccentrically journaled in thesaid chamber and the sliding blades or paddles carried by thepiston-body, and provided each with a valve-controlled port, said bladesbeing adapted to be projected and withdrawn in alternation with eachother, substantially as described.

5. In an air and gas mixer, the combination of the chamber havinginduction and eduction ports, the compressor-piston mounted thereinconsisting of the piston-body in the said chamber, the sliding blades orpaddles carried by the said piston-body provided with ports, and thesliding gates adapted to control the said ports, substantially asdescribed.

6. In an air and gas mixer, the combination of the cylindrical chamberhaving induction and eduetion ports, the compressor piston mountedtherein consisting of the cylindrical piston-body eccentricallyjournaled in the said chamber, the sliding blades or paddles carried bythe said piston-body provided with ports, and the adjustable slidinggates adapted to control the said ports, substantially as described.

7. In an air and gas-mixer, the combination of the cylindrical chamberhaving the induction and eduetion ports the compressor-piston mountedtherein consisting of the cylindrical piston-body eccentrieallyjournaled in Signed at New York, in the county of New York and State ofNew York, this 21st day of IO the said chamber, the spring-pressedsliding December, A. D. 1889. blades or paddles carried by the saidpistonbody, the said blades 01' paddles being provided with ports, andspring-pressed gates controlling the said ports, substantially asdescribed,

JOHN MURRAY MITCHELL.

Witnesses: I

EMIL A. JULY, R. EMMET DOHERTY.

